Gas-engine.



A. P. PARKS.

GAS ENGINE.

APPLIOATI N' FILED MAY 24, 1911.

Patented Aug. 19, 1913.

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WITNESSES.-

A. P. PARKS.

GAS ENGINE.

APPIJIGATIQN FILED MAY 24, 1911v z sums-sum? '2.

Patented Aug. 19, 1913.

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.21. 33min, 2.1.52 .Xi

QAS-EHGINE.

Application filed May whomwm-y concern known that l. 3*"

wow, Y t; .n defects and limitations iary engines oi this any he mentioned to working cyli a ole lealiage oi? ninture cc and exhaust posts under par ions ' tional v y i e W ei-ition Z) the crank; case cy-ln, era; 8, f, the pistons and connect 1g rods a i shaft and the 'oiscons, n

one oi tje pistons y tl'ie pi ton f) is a 31?: laterai proiecting lug j to which is secured t r 3' oi a piston Worlring in. the This piston rod is i nil With the a oi? the Working 2 and is guide ide tiie cylinderritbly inside the limits of the pace in the upper part of -cn.nder Z6 is a port o communi-, "l; the chamber m. in the lower r the pzung; 7' i iia port p cc'nr -tingn'itii a Between c ll in and v tilt 2r (7 is an automatic L) clos' moves upward "Ween chaml1 er n and working cylinder (Z ls'a similar auto matic valve st 2", t, etc are eXhaust ports in the working cylinders, which ports are uncovered in the extreme outward position oi the J-1stons c and f, as in usual-tWo-cycle practice u and c are inlet ports to the chambers m and a respectively, through which explosive CHEMGZ'JN hi-ijhi, BEN SYLVANIA;

. Specification. of

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1.911. aerial No. 629,127.

mixture from a usual type of carburetor is introduced through chcclcvalycs do," one of which is shown in Fig. v1. I i

. The (mention oi the foregoing construction will be readily understood by. one skilled in the art. in expandingchargc in the \VmkiI'if-Z cylinder (Z forces down the piston f, ahich carries with it the pistoni in pining-cylinder 7c thus compressing the chargc in chan'iber 'n, T he valve 8 is hold closed by the pr'epondcrance of pressure in cylinder (Z up to the moment when the exhaust ports in this cylinder-are uncovered in the outward movement of the piston. In the meantime the descendingpiston 2' in pu nprylinden has created -a partial vacuum in chamber am, into which explosive mixture rushes from the carburetor through thechcck-Yalve w and port 2a. At the moment the exhaustports in cylinder (Z are uncm'crcd, thoreinaining pressure in this cyl- ,inder immediately drops to-'-tl1at of the atmosphere, valve, .9 opens, and the compressed charge 111 chamber 02 flows into cylinder cl completely filling this cylinder and dis placing all products of combustion therein remaining; it beingunderstood that cylinders (Z and 7c are properly proportioned With respect to areas. Upon the next upward stroke of piston f the charge in cylinder 0? is compressed, and ignited at the proper instant in the usual manner. During thc'upward movement of piston f, the piston 71 compresses the charge in-chainber 0m When the exhaust ports in cylinders are uncovered, valve 3 opens, and this charge flows into cylinder (2 and is compressed and ig nited at 180 fri'un that-in the cylinder (Z.

The construction described is'a Well bal anccd form of construction and effects equally spaced power in'ipulses.v It permits ot' 'a simple form of crank-shaft, an open crank-case if desired, and the use of ballor roller-bearings practically impossible in the usual form of two-cycle engine construction. The volumetric efficiency of the Workingcylinder is increased over the usual type of engine due to the fact that a cylinder full of pure explosive mixture uncontaminated with previous products of combustion 1s available.

The foregoing description Will be recognized as covering What is'usually knownas.

a two-port type of engine with automatic inlet valve. If the. cylinder is be slightly 1ncreased in length, as shown at In, Fig. 4,

what I claim and desire ters 'Patent is and a piston :12, of such a length as to uncover the port 3 at the extremes of its travel be provided, and the carbureter connected at z, omitting a check-valve, .the three-port-type of engine results.

\Vhile my invention is described and illustrated as applied to a two-cylinder type-of engine, it is obvious that it is capable of em- 7 bodiment of a single-cylinder engine, which, indeed, would result if the cylinder 0, its piston a, and chamber m were removed.

Having now fully described my invention,

to protect by Let- 1. In a gas engine, the combination with a crank shaft, a pair of power cylinders,

pistons therein and connecting rods betweenthe power pistons and 'thecrank shaft, of a power pistons and'crank shaft, andexhaust ports to the atmosphere in each power cylind er, of a double acting'pump cylinder, a

" pisbontherein, means connecting the pump piston with one of the power pistons whereby. they reciprocate in unison, a compresnecting each compression chamber with one,

sion chamber connected with each end of the pump cylinder, inlet ports to the compression chamber and automatic valves conof the power cylinders, whereby, at each stroke, the requisite charge is drawn into one of the compressionchambersand compressed suiiiciently to discharge through the automatic valve into the .re-

speot-ive power cylinder at the time the ex-.

haust port in the latter is open.

3. In a gas engine, the combination with a crank shaft, of a pair. of working cylinders and power pistons therein, connecting rods between the crank-shaft and pistons,

a pinup-cylinder and a piston therein, ex

haust ports in the working cylinders, a pair of compression chambers, an automatic valve betweenv each I compression chamber and the corresponding working .cylinder,

ports in the pump cylinder arranged respectively above and below the pump piston and communlcatmg with I the respective compression chambers, meansconnecting the hereunto set my pump piston and one of the power pistons, and insans' permitting ingress of fresh charges of motive fluid alternately to the tryo gfompression chambers. I 1

{,In. testimony'of which invention, I have hand, at Philadelphia, on this 23rd day of May, 1911.

. ALBERT F. PARKS. Vitneises: p

M M. HAMILTOiI,

A. J. Mncpnm.

itself 

